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Reports any non-final field in a class with the <code>@Immutable</code> annotation.
This violates the contract of the <code>@Immutable</code> annotation.
<p>Example:</p>
<pre><code>
  import javax.annotation.concurrent.Immutable;
  @Immutable
  class Foo {
    String bar = "foo";
  }
</code></pre>
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<p>Supported <code>@GuardedBy</code> annotations are:</p>
<ul>
  <li><code>net.jcip.annotations.GuardedBy</code></li>
  <li><code>javax.annotation.concurrent.GuardedBy</code></li>
  <li><code>org.apache.http.annotation.GuardedBy</code></li>
  <li><code>com.android.annotations.concurrency.GuardedBy</code></li>
  <li><code>androidx.annotation.GuardedBy</code></li>
  <li><code>com.google.errorprone.annotations.concurrent.GuardedBy</code></li>
</ul>
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